68results about How to "Reduce nodulation" patented technology

The invention discloses a high-brand non-oriented silicon steel as well as a manufacturing method, which are mainly characterized in that: chemical constituents thereof include, in weight percent: Si: 2.5 to 3.5 percent, Al: 0.5 to 1.5 percent, C<=0.004 percent, Mn: 0.10 to 1.50 percent, P<=0.02 percent, S<=0.005 percent, N<=0.002 percent, B<=0.005 percent, B/(C+N)=0.5-2.0; and the manufacturing method mainly includes: heating a casting billet to above 1100DEG C in a heating furnace, carrying out rolling, normalizing, acid washing and cold rolling after heat preservation, with the reduction rate of between 70 and 78 percent, and annealing, with d.p. equal to -25 to -40DEG C. The non-oriented silicon steel and the manufacturing method can make electric steel sheets and strips with excellent performance, and can reduce furnace roller nodulations and energy consumption in production, and further reduce the production cost.

The invention discloses a method for controlling and treating bottom roller dross of a carbon sleeve furnace. The possibility of dross occurrence is reduced by effective preventive measures for controlling the brushing current of a brush roller, reducing the use of a severely-oxidized transition strip, controlling appropriate furnace pressure, dew point and hydrogen content according to the difference of process speeds and process temperatures, periodically adjusting the rotating speed of a furnace roller, reducing running speed difference between the furnace roller and band steel, controlling the temperature raising and lowering rates of process temperature transformation during steel transformation and the like. Simultaneously, different treatment methods are used according to different dross states, so that treatment time is shortened greatly. The problems of long treatment time, single treatment method, no distinguished treatment according to different dross states, grinding of all furnace bottom rollers during treatment, damage to the furnace bottom rollers without dross, effect on service life and the like are solved, the plate surface quality of a cold-rolled and annealed product is enhanced and product percent of pass is increased.

The invention provides a method for smelting low-carbon aluminium-killed steel, comprising the following steps: carrying out primary smelting by adopting a converter top and bottom combined blowing way, and then tapping molten steel obtained by the primary smelting into a steel ladle; blocking slag and predeoxidising in the tapping process, wherein the slag is blocked to ensure that the total content of FeO and MnO which enter the steel ladle is 3-5wt% of the molten steel entering the steel ladle, and the predeoxidising operation comprises the step of adding ferro-aluminium deoxidizer into the molten steel and can ensure that the oxygen content of the molten steel is 10-100ppm; carrying out primary aluminium feeding on the molten steel in the steel ladle before the molten steel in the steel ladle is refined after tapping is completed; refining the molten steel after the primary aluminium feeding is completed, and carrying out secondary aluminium feeding in the refining process; and removing impurities floating on the liquid surface of the molten steel. The invention also provides a method for continuously casting the low-carbon aluminium-killed steel, comprising the following steps: pouring the molten steel obtained by adopting the method for smelting the low-carbon aluminium-killed steel into a crystallizer, and continuously pulling and cooling. By adopting the method for smelting the low-carbon aluminium-killed steel, the purity of the molten steel can be obviously improved, and the accretion in the continuous casting process can be reduced.

The invention discloses calcium-aluminium- ferrum alloy for steel- melting and deoxidizing, the weight proportion of them is as follows: 15% C21C 7/06 C22C 33/04 C22C 33/06 0 6 1 2007/7/16 101086029 2007/12/12 100475980 2009/4/8 2009/4/8 2009/4/8 Guo Qingcheng Liaoning 117100 Guo Qingcheng Fan Songtao

The invention aims at disclosing a compressing double deoxidizer for steelmaking, which, by weight percentage, comprises 5-20% of Ca, 0-8% of Mg, 0-20% of Al, less than 0.03% of S, less than 0.02% of P, 2-10% of binder and balanced Mn. The invention further aims at disclosing a preparation method of the compressing double deoxidizer for the steelmaking, raw materials are added in the binder after mixed according to the proportion and evenly mixed, the mixed raw materials are put in a compression molding press with the pressure less than 20T for pressing, the stoving temperature is set to be 60-120 DEG C to dry a compressed double deoxidizer block for 15-60min, and a dried compressed double deoxidizer block is cooled and packaged to obtain the needed compressing double deoxidizer for the steelmaking.

The invention relates to a smelting assistant for steel works, namely a low-temperature pulverization inhibitor for sintered ore. The low-temperature pulverization inhibitor is prepared by mixing carboxymethyl starch, boric acid, silicon micropowder and a permeate agent in designated proportion; compared with CaCl, Cl ion drag-in quantity is reduced more than 50%, the low-temperature pulverization inhibitor can not generate a replacement reaction with K and Na alkali metals in a furnace charge, therefore, the problem of continuous and circulating enrichment of KCl (kirchhoff's circuit laws) and NaCl in a blast furnace is solved, the reactivity of coke is restrained, the melting loss reaction is reduced, the heat intensity of the coke is ensured, low temperature reduction pulverization rate of the sintered ore is reduced, the destructive effect of the alkali metal on the coke and the blast furnace is basically solved, the furnace condition is smooth, and the output is increased.

The invention relates to high-purity steel and a production process, and belongs to the technical field of steel production. The production process comprises the procedures of carrying out converter primary smelting, carrying out LF refining, carrying out VD vacuum treatment and carrying out continuous casting, the LF refining procedure comprises the following steps that (21) online bottom argon blowing is carried out when the steel enters a station, the argon flow is 120-140L/min, and the Ar pressure is 0.35-0.4MPa; (22) a slag former and a deoxidizing agent are added for first-time electrifying slagging, 6-level voltage is adopted, the current is 28000-30000A, the argon flow is 280-300L/min, the argon pressure is 0.35-0.4MPa, sampling is conducted after slagging is conducted for 8-12min through power transmission heating, and alloy is added to adjust components; the slag former comprises 4.5-7.2kg of calcite per ton of steel, 0.7-1.1kg of fluorite per ton of steel and 0.3-0.5kg of bauxite per ton of steel; and (23) after the components are adjusted, secondary electrifying is conducted, 4-level voltage is adopted, the current is 32000-34000 A, the argon flow is 70-90L/min, the Ar pressure is 0.3-0.35MPa and when the temperature of molten steel is greater than or equal to 1670 DEG C, a silicon-calcium wire is fed. The high-purity steel and the production process have the effects of reducing the impurity content in the molten steel and improving the purity of the molten steel.

The invention provides an electrolysis device and method. The electrolysis device comprises an electrolysis tank, at least one cathode in the electrolysis tank, multiple anodes arranged around the cathode in intervals and multiple air blowing pipes symmetrically arranged on the inner wall of the electrolysis tank, wherein bottom outlets of the air blowing pipes stretch out of the bottom surface of the electrolysis tank and are arranged along a horizontal direction. An electrolyte at the bottom of the electrolysis tank is stirred through gas and a gas outlet direction and a cathode center direction form an a certain angle in air blowing so that the electrolyte on the bottom produces eddy currents along a horizontal direction and the electrolyte in all zones in the electrolysis tank can circularly flow and thus heat transfer and mass transfer in the electrolysis tank are improved, inner temperatures and components are uniformed, product quality is improved and furnace conditions are improved.

The invention discloses a method for solving blockage of a pouring nozzle of a billet caster producing high carbon chromium bearing steel. The method includes LF refining, RH refining and a casting process. According to the method, calcium treatment operation is carried out in the middle of the LF refining. Calcium line addition is 0.10-0.35 kg/t steel. The content of molten steel Ca is controlledwithin 0.0010-0.0025 wt %. The sulfur content of the molten steel is less than or equal to 0.010 wt % before calcium treatment, otherwise the calcium treatment is delayed. Aluminum products are not added into the molten steel in the later period of the LF refining and the RH process. A slab section of the billet caster is less than or equal to 260mm*260mm. A tundish nozzle is an immersion nozzle,and an argon blowing stopper with holes is not needed to be used. The method solves the technical problems troubling the billet caster producing high carbon chromium bearing steel for a long time that the immersion nozzle is likely to be plugged, causing the billet caster to have accidents to stop pouring, the molten steel to return to a furnace or falls to the ground. The method reduces the production cost, improves the benefit of an enterprise and has excellent promotion and application value.

The invention discloses an anti-corrosion nodule-free sink roll which comprises a cylindrical roll body and roll shafts connected with the two ends of the roll body, wherein a spiral groove is formed in the surface of the roll body; the bottom of the spiral groove is arc-shaped; a wear-resistant coating is arranged on the surface of the spiral groove; the anti-corrosion nodule-free sink roll is further improved in that the wear-resistant coating on the surface of the spiral groove is a carbon tungsten alloy layer; and the roll body comprises an alloy sleeve, a metal-ceramic sleeve and a sealant layer, which are distributed from inside to outside in a radial direction in sequence. The anti-corrosion nodule-free sink roll has good corrosion resistance, solves the problem that nodules are formed on the surface of a conventional roll, and improves the product quality.

The invention discloses an electrical steel annealing and heating support method which comprises a furnace body (2), wherein the furnace body (2) comprises a heating zone (3), a soaking zone (4), a support roller (6) and a plasma nozzle (5); the heating zone (3) and the soaking zone (4) are used for annealing a steel strip; the support roller (6) is used for supporting the steel strip in the furnace body (2); the plasma nozzle (5) is used for ejecting a gas from the steel strip and supporting the steel strip; and the steel strip is separated from the support roller (6) in the annealing process and is kept suspended through the plasma nozzle (5), so that damages or nodulation to the support roller (6) in the heating process can be avoided or relieved; and high-silicon and high-grade electrical steel with high magnetic properties (low iron loss and relatively high grade) and excellent surface quality is obtained.

The present invention provides an efficient composite desulfurization agent, a preparation method and applications thereof, wherein the efficient composite desulfurization agent comprises, by mass, 65-75% of quick lime, less than or equal to 10% of limestone, 5-10% of soda ash, less than or equal to 10% of fluorite, and less than or equal to 5% of graphite. According to the present invention, the premix, ie., the composite desulfurization agent, is transported by a tank car and is subjected to pressurization conveying to a desulfurization agent bin, and during the desulfurization treatment, the desulfurization agent is introduced into a spraying-blowing tank from the desulfurization agent bin, and is pressurized, and the pressurized desulfurization agent is sprayed into liquid iron in a spraying-blowing manner so as to perform desulfurization; and compared to the unimproved Baosteel steelmaking plant torpedo car desulfurization agent, the efficient composite desulfurization agent of the present invention has the following characteristics that the consumption is significantly reduced (the maximum unit consumption decrease of the desulfurization agent during the application is 2.95 Kg/t) under the same liquid iron condition and the same desulfurization requirement, and due to the significantly reduced desulfurization agent consumption, the temperature decrease of the desulfurization treatment is significantly decreased (the temperature decrease is decreased by 9.43 DEG C/torpedo car).

The invention discloses an electrical sheet plasma suspension device and a manufacturing method thereof. The electrical sheet plasma suspension device comprises a support seat and an electrode bar (2), wherein the support seat is fixedly connected with a furnace bottom plate (1) and is insulated from the furnace bottom plate (1); a cavity is arranged in the support seat; the electrode bar (2) extends into the cavity of the support seat; an outlet (8), through which gas in the cavity of the support seat is ejected, is formed in the upper end surface of the support seat; the upper end surface of the support seat is an electrical sheet supporting surface; an inlet (7), through which gas flows into the cavity from a furnace, is formed in the lower end of the support seat; a power supply (6) is connected with the electrode bar (2) and the support seat through a circuit; and the part, which is connected with the circuit, of the support seat is made of a conductive material; and the gas flowing into the cavity through the inlet (7) discharges electricity in an upper cavity (41) and a lower cavity (31) to form plasma, and then is ejected from the outlet (8) to a running steel strip to form a support for the steel strip so as to avoid or reduce the surface damage of the annealed steel strip.

The invention discloses a nozzle coating for continuous casting of rare earth steel and a preparation method of the nozzle coating, belongs to the technical field of refractory materials, and solves the problem that a nozzle is nodulated and blocked in the current continuous casting process of the rare earth steel. The invention relates to a nozzle coating for continuous casting of rare earth steel, which comprises the following components: magnesium aluminum oxide and rare earth oxide, and the mass ratio of the magnesium aluminum oxide to the rare earth oxide is 83.3-94: 1.98-10; the magnesium-aluminum oxide is MgO.Al2O3 or takes MgO.Al2O3 as a main component, and contains a trace amount of MgO; the rare earth steel is steel containing rare earth cerium and/or lanthanum, and the type of the rare earth oxide is the same as that of rare earth in the rare earth steel. The nozzle coating can reduce nodulation of the submersed nozzle in the rare earth steel continuous casting process, so that the replacement frequency of the submersed nozzle is averagely reduced by more than 50%, and smooth operation of rare earth steel continuous casting is guaranteed.

The invention relates to a high-chromium-slag detoxification formula and a synergistic light aggregate production process. The formula comprises the following raw materials in percentage by mass: 60-80% of chromium slag, 15-40% of aluminum-silicon concentrate and 1-5% of a compound additive. The aluminum-silicon concentrate comprises one or more of clay, potassium feldspar, quartz, aluminum oxide, flint clay, mullite and kaolinite. And the compound additive plays a role in reduction and fluxing. The raw materials are dried, metered, crushed, ball-milled, granulated, fired and screened to obtain a fired lightweight aggregate product. Compared with the prior art, the specific gravity of the chromium slag in the formula is increased to 80%, the firing temperature is reduced to 900-1000 DEG C on the basis that hexavalent chromium in the fired lightweight aggregate product is thoroughly reduced and cured by adding the compound additive, and trivalent chromium cannot be oxidized due to temperature reduction under the condition of no cooling process. On one hand, thorough harmlessness of the chromium slag is achieved, and on the other hand, complete recycling of the chromium slag is achieved.

The invention discloses a roasting shaft furnace which comprises a furnace body, more than two combustion chambers and a drying bed located at the top of the furnace body. An inner cavity of the furnace body is sequentially divided into a drying section, a roasting section, a soaking section and a cooling section from top to bottom. The combustion chambers are located at the position, corresponding to the roasting section, of the lateral side of the furnace body and communicated with the inner cavity of the furnace body. A hot air return assembly is arranged on the furnace body. An air inlet end of the hot air return assembly is communicated with the position, located at the bottoms of the combustion chambers, of the inner cavity of the furnace body. An air outlet end of the hot air return assembly is communicated with the position, located between the tops of the combustion chambers and the drying bed, of the inner cavity of the furnace body. The roasting shaft furnace has the advantages of being simple and compact in structure, low in cost, long in service life, stable and reliable in working, strong in operational adjustment, capable of optimizing furnace inside atmosphere and reducing energy consumption for material roasting, even in heating and the like.